Add secret management guide, client-side performance monitoring, and search accessibility enhancements

- Introduced a comprehensive Secret Management Guide detailing best practices, secret classification, development setup, production management, rotation procedures, and emergency protocols.
- Implemented a client-side performance monitoring script to track various metrics including page load performance, paint metrics, layout shifts, and memory usage.
- Enhanced search accessibility with keyboard navigation support for search results, ensuring compliance with WCAG standards and improving user experience.

backend/config/settings/__init__.py

@@ -1 +1,25 @@
-# Settings modules package
+"""
+ThrillWiki Modular Settings Package
+
+This package contains modular configuration files for the ThrillWiki project.
+Each module focuses on a specific aspect of the application configuration.
+
+Modules:
+- database.py   - Database connections and GeoDjango settings
+- cache.py      - Redis caching and session configuration
+- security.py   - Security headers, CSRF, and authentication
+- email.py      - Email backends and configuration
+- logging.py    - Logging formatters, handlers, and loggers
+- rest_framework.py - DRF, JWT, CORS, and API documentation
+- third_party.py    - Allauth, Celery, Cloudflare, health checks
+- storage.py    - Static files, media, and WhiteNoise
+
+Usage:
+    These modules are imported by the environment-specific settings files
+    in config/django/ (base.py, local.py, production.py, test.py).
+
+Why python-decouple?
+    All modules use python-decouple for environment variable management
+    because it's already used in base.py, provides a simpler API than
+    django-environ, and is sufficient for our configuration needs.
+"""